Deira

A northern Anglo-Saxon kingdom in Britain which, by the last quarter of the 7th century AD, had been united with its neighbour Bernicia (q.v.) to form the kingdom of Northumbria. Deira stretched from the Humber to the Tees River. There is a tradition that its first recorded king, Aelle, reigned from 560 and that, on his death in 588 or 590, Deira was seized by Aethelric of Bernicia, whose son